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Ibotombi Singh, N.
- Pillow Basalts from the Manipur Ophiolitic Complex (MOC), Indo-Myanmar Range, Northeast India
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791113, IN
2 Department of Geology, D M College of Science, Imphal - 795 001, IN
3 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Northeast Unit, Itanagar - 791113, IN
2 Department of Geology, D M College of Science, Imphal - 795 001, IN
3 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 168-174Abstract
Pillow basalts have been reported from the Manipur Ophiolitic Complex (MOC) of the Indo-Myanmar Range. The pillows are closely packed together or individualistic and they are varying from 50 cm to 0.5m in diameter and vary from undeformed spheroid to flattened ellipsoids. They are ranging from silica undersaturated nephenine in norms) to silica saturated (hypersthene in norms) with respect to silica and characterized by enrichment of Large Ion Lithophile Elements (LILE) and depleted of TiO2, P2O5, Nb, Nb/Y values with high concentration of Al2O3, Cr, Ni and affinity with sub-alkaline and tholentic basalt in composition. The sub-aqueous natures of volcanism are indicated by the presence of pillow structures. Petrological and geochemical studies indicate that pillow basalts of Manipur Ophiolitic Complex are derived from a common source at higher degree of partial melting and possibly emplaced in a plate margin environment, which could be in a back arc basin of an oceanic environment that overlap the N-type MORB and IAB.Keywords
Pillow Basalt, Geochemistry, Manipur Ophiolitic Complex, Indo-Myanmar Range.
- Geochemical Study of Peridotites from the Manipur Ophiolite Complex, Northeast India with Special Reference to their PGE Concentration
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Authors
Affiliations
1 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
1 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 3 (2011), Pagination: 273-279Abstract
The peridotites of the Manipur Ophiolite Complex (MOC) have been examined based on mineral chemistry, major elements and PGE contents. They represent high-magnesian cumulates with Mg# > 0.90 (Mg/Mg+Fe) in olivine and Cr# > 0.12 (Cr/Cr+Al) in spinel. High Mg* contents of the olivine show that these rocks are most likely derived from partial melting of the residual upper mantle. The peridotites contain higher concentration of Palladium Group PGE (PPGE) (Rh=4.4-6.6ppb; Pd=336-458ppb and Pt=14.6-36.4ppb) than the Iridium Group PGE (IPGE) (Os=2.4-5.8ppb; Ir=3.2-4.16ppb and Ru=5.2-7ppb). These are characterized by overall enrichment of PGE concentration (ΣPGE=365.8 - 516.6 ppb) and high ratio of (Pt+Pd)/(Os+Ir+Ru). This suggests that the rocks are formed by partial melting and crystal fractionation of olivine-rich (picritic) magma.Keywords
Manipur Ophiolite Complex, Eastern Indian Plate Margin, Peridotite, Fractional Crystallization, PGE, Picritic Magma, Manipur.- Geochemistry of Mid-Ocean Ridge Mafic intrusives from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, GMS Road, Dehradun - 248 001, IN
2 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
1 Wadia Institute of Himalayan Geology, GMS Road, Dehradun - 248 001, IN
2 Department of Geology, D.M. College of Science, Imphal - 795 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 231-240Abstract
Mafic intrusives emplaced within the melange zone of the Manipur Ophiolitic Complex are subalkaline-tholeiitic affinity with Fe-enrichment. Based on the field occurrences, textures-mineralogy and whole-rock compositions, these mafic intrusives can be identified as type-I (gabbro intrusives) and type-II (basalt-dolerite dykes). The type-I resembling enriched-type mid-ocean ridge basalt (E-MORB) shows moderate LREE enrichment (LaN/SmN = 2.5-2.6), slightly enriched MORB normalized HFSE patterns possibly represent melts derived from enriched MORB sub-oceanic mantle sources by small degree of partial melting. The other type-II has normal-type mid-ocean ridge basalt (N-MORB) geochemical features, as it exhibits nearly flat to depleted LREE (LaN/SmN = 1.0-0.6), flat MORB normalized HFSE patterns with slight LREE/HREE depletion (CeN/YbN = 1.37-0.46). It might have been derived from depleted MORB type sub-oceanic mantle source. The MORB signature displayed by these mafic intrusives indicates that they are dismembered fragments of oceanic crust generated at mid-ocean spreading ridge system and support the hypothesis that the Manipur ophiolites was initially formed in the divergent plate margin.Keywords
Mafic Intrusives, MORB, Geochemistry, Manipur Ophiolite Complex, North East India.References
- ACHARYYA, S.K., RAY, K.K. and ROY, D.K. (1989) TectonoStratigraphy and emplacement history of the Ophiolite assemblage from the Naga Hills and Andaman Island arc India. Jour. Geol. Soc. India. v.33, pp.4-18.
- ACHARYYA, S.K., RAY, K.K. and SENGUPTA, S. (1990) Tectonics of the Ophiolite belt from Naga Hills and Andaman Islands, India. Proc. India Acad. Sci., Earth Planet. Sci., v.99(2), pp.187-199.
- ACHARYYA, S.K., ROY, D.K. and GHOSE, S.C. (1986) Stratigraphy and emplacement history of the Naga Hills Ophiolite, Northern Indo-Burmese Range. Bull. Geol. Min. Metal.. Soc. India, v.54, pp.1-17.
- AGRAWAL, O.P. and GHOSE, N.C. (1986) Geology and stratigraphy of the Naga Hills ophiolite between Meluri and AwangkhooPhek district, Nagaland, India. In: N.C. Ghose and S. Varadarajan (Eds.), Ophiolites and Indian Plate Margin, Sumna Publication, Patna, pp.163-195.
- AHMAD, T, ISLAM, R, KHANNA, P.P. and THAKUR, V.C. (1996) Geochemistry, petrogenesis and tectonic significance of the basic volcanic units of the Zildat ophiolitic melange, Indus suture zone, eastern Ladakh (India). Geodinamica Acta, v.9, pp.222-233.
- ALDANMAZ, E., YALINIZ, M.K., GÜCTEKIN, A. and GÖNCÜO LU, M.C. (2008) Geochemical characteristics of mafic lavas from the Neotethyan ophiolites in western Turkey: implications for heterogeneous source contribution during variable stages of ocean crust generation. Geol. Mag., v.145, pp.37-54.
- BEDARD, J.H. (1999) Petrogenesis of boninites from the Betts Cove ophiolite, Newfoundland, Canada: Identification of subducted source components. Journal of Petrology, v. 40, pp. 1853-1889.
- BENDER, F. (1983) Geology of Burma. Berlin-Stuttgart, Gebruder Borntraeger, 293p.
- BHATTACHARJEE, C.C. (1991) The ophiolites of north east India- a subduction zone ophiolite complex of the Indo-Myanmar Orogenic belt. Tectonophysics, v.191, pp.213-222.
- BRUNNSCHWEILER, R.O. (1966) In the geology of Indo Burman Range. Jour. Geol. Soc. Australia, v.13, pp.137-195.
- CHATTOPADHYAY, B. M., VENKATARAMAN, P., ROY, D.K. GHOSE, S. and BHATTACHARYA, S. (1983) Geology of Naga Hills Ophiolites. Rec. Geol. Surv. India, v.113(2), pp.59-115.
- CHUNGKHAM, P. and JAFAR, S.A. (1998) Late Ctretaceous (Santonian-Maastrichtian) integrated Coccolith-Globotruncanid biostratigraphy of pelagic limestone from the accretionary prism of Manipur, Northeastern India. Micropaleontology, v.44, pp.68-83.
- COISH, R.A., HICKEY, R. and FREY, F.A. (1982) Rare earth element geochemistry of the Betts Cve ophiolite, Newfoundland: Complexities in ophiolite formation: Geochimica et Cosmochim Acta, v. 46, pp. 2117–2134.
- EVANS, P. (1932) Tertiary succession in Assam. Trans. Min. Geol. Inst., v.27(3), pp.155-260.
- GANSSER, A. (1980) The significance of the Himalayan suture zone. In: J.M. Tater (Ed.), The Alpine Himalayan Region. Tectonophysics, v.62, pp.37-52.
- GHOSE, N.C., AGRAWAL, O.P. and SINGH, R.N. (1986) Geochemistry of the ophiolite belt of Nagaland, N.E. India, In: N.C. Ghose and S. Varadarajan (Eds.), Ophiolite and Indian plate margin. Sumna Publication, Patna, pp.241-293.
- IRVINE, T.N. and BARAGAR, W.R.A. (1971) A guide to the chemical classification of the common volcanic rocks. Canadian Jour. Earth Sci., v.8, pp.523-548
- JENSEN, L.S. (1976) A new cation plot for classifying sub-alkaline volcanic rocks. Misc. Paper, Ontario, Div. Mines No. 66.
- JAMES, S.D., PEARCE, J.A. and OLIVER, R.A. (1987) The geochemistry of lower proterozoic Willyama Complex volcanics, Broken Hill block, New South Wales. Geol. Soc. London, Spec. Publ., v.33, pp.395-408.
- LAFLECHE, M.R., DUPUY, C. and BOUGAULT, H. (1992) Geochemistry and petrogenesis of Archean mafic volcanic rocks of the southern abitibi Belt, Quebec. Precambrian Res., v.57, pp.207-241.
- MALLET, F.R. (1876) On the coal fields of Naga hills bordering the Lakhimpur and Sibsagar districts, Assam. Mem. Geol. Surv. India, v.12(2), pp.166-363.
- MESCHEDE, M. (1986) A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram. Chemical Geol., v.56, pp.207-218.
- MITCHELL, A.H.G. (1981) Phanerozoic plate boundaries in mainland SE Asia, the Himalayas and Tibet. Jour. Geol. Soc. London, v.138, pp.109-122.
- MITRA, N.D., VIDYADHARAN, K.T., GOUR, M.P., SINGH, S.K., MISHRA, U.K., KHAN, I.K. and GHOSH, S. (1986) A note on the Olitostromal deposits of Manipur. Rec. Geol. Surv. India, v.114, pp.61-76.
- MOORE, G.F., CURRAY, J.R, MOORE, D.G. and KARIG, D.E. (1980) Variations in geologic structure along the Sunda forearc, NE Indian ocean. In: The Tectonic and Geological Evolution of SE Asian Seas and Islands. Geophys., Mono, v.23, pp.145-160.
- PAGE, B.G.N., BENNETT, J.D., CAMERON, N.R., BRIDGE, D. MCC, JEFFREY, D.M., KEATS, W. and THAIB, J. (1979) A review of the main structural and magnetic features of northern Sumatra. Jour. Geol. Soc. London, v.136, pp.569-579.
- PEARCE, J.A. (1996) A user’s guide to basalt discrimination diagrams. In: Trace element geochemistry of volcanic rocks; applications for massive sulphide exploration, Geological Association, Canada, v.12, pp.79-113.
- PEARCE, J.A. and NORRY, M.J. (1979) Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks. Contrib. Mineral. Petrol., v.69, pp.33-47.
- PHOTIADES, A., SACCANI, E. and TASSINARI, R. (2003) Petrogenesis and tectonic setting of volcanic rocks from the subpelagonian ophiolitic melange in the Agoriani area (Othrys, Greece). Ofioliti, v.28(2), pp.121-135.
- SACCANI, E., PHOTIADES, A. and PADOA, E. (2003) Geochemistry, petrogenesis and tectono-magmatic significance of volcanic and subvolcanic rocks from the Koziakas mélange (western Thessaly, Greece). Ofioliti, v.28(1), pp.43-57.
- SAGE, R.P., LIGHTFOOT, P.C. and DOHERTY, W. (1996) Bomodal cyclical Archean basalts and rhyolites from the Michipicoten (Wawa) greenstone belt, Ontario: geochemical evidence for magma contributions from the asthenospheric mantle and ancient continental lithosphere near the southern margin of the Superior Province. Precambrian Res., v.76, pp.119-153.
- SAUNDERS, A.D., NORRY, M.J. and TARNEY, J. (1988) Origin of MORB and chemically-depleted mantle reservoirs: trace element constraints. Oceanic and Continental Lithosphere: Similarities and Differences, Jour. Petrol., Spec. Issue, pp.414-445.
- SHERVAIS, J.W. (1982) Ti-V plots and petrogenesis of modern ophiolitic lavas. Earth Planet. Sci. Lett., v.59, pp.101-118.
- SINGH, A.K. (2008) PGE distribution in the Ultramafic rocks and chromitites of the Manipur ophiolite Complex, Indo-Myanmar Orogenic Belt, Northeast India. Jour. Geol. Soc. India, v.72, pp.649-660.
- SINGH, A.K. (2009) High-Al chromian spinel in peridotites of Manipur Ophiolite Complex, Indo-Myanmar Orogenic Belt: implication for petrogenesis and geotectonic setting. Curr. Sci., v.96, pp.973-978.
- SINGH, A.K., SINGH, N.I., DEVI, L.D. and SINGH, R.K.B. (2008) Pillow basalts from the Manipur Ophiolitic Complex (MOC), Indo-Myanmar Range, Northeast India. Jour. Geol. Soc. India, v.72, pp.168-174.
- SINGH, N.I. (1992) Petrology and Geochemistry of carbonate rocks in and around Ukhrul areas, Manipur state, India. Ph.D.Thesis (unpublished), Manipur University, Imphal. 288p.
- SINGH, R.N. and GHOSE, N.C. (1981) Geology and stratigraphy of the ophiolite belt of Naga Hills, East Kiphire, N.E.India. In: V.J. Gupta (ed), Records, Research Geology, 8, Hindusthan Publication Corporation., New Delhi, pp. 359-381.
- SUN, S.S. and MCDONOUGH, W.F. (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: A.D. Saunders and M.J. Norry (Eds.), Magmatism in the Ocean basins. Jour. Geol. Soc. London, Spec. Publ., v.42, pp.313-145.
- TAYLOR, S.R. and MCLENNAN, S.M. (1985) The continental crust: Its composition and evolution, Blackwell Scientific Publ., Oxford, 312p.
- VAN BEMMELEN, R.W. (1970) The Geology of Indonesia. The Hague, Govt. Printing Office, 2nd Ed. 732p.
- Venkataramana, P., Dutta, A.K. and Acharyya, S.K. (1986) Petrography and petrochemistry of Naga Hills Ophiolite. Geol. Surv. India, v.119, pp.33-63.
- VIDYADHARAN, K.T., JOSHI, A., GHOSE, S., GAUR, M.P. and SUKLA, R. (1989) Manipur Ophiolites. Its Geology, tectonic setting and metallogeny, In: N.C. Ghose (Ed.), Phanerozoic Ophiolites of India, Sumna Publ., Patna, pp.197-212.
- VILLEMANT, B., JAFFREZIC, H., JORON, J.L. and TREUIL, M. (1981) Distribution coefficient of major and trace elements; fractional crystallisation in the alkali basalt series of Chaine des Puys (Massif Central France). Geochim. Cosmochim. Acta, v.45, pp.1997-2016.
- ZINDLER, A. and HART, S.R. (1986) Chemical geodynamics. Ann. Rev. Earth Planet. Sci. v.14, pp.493-571.